Use the auto-discovered metrics in prometheus to monitor volume free space.
Use the auto-discovered metrics in prometheus to monitor volume free space.

Bug: skia:
Change-Id: I02f575c371dafb37d94a40d0043d2164551d8f7e
Reviewed-on: https://skia-review.googlesource.com/127391
Reviewed-by: Ben Wagner <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot